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It only seems redundant in this case because YouTube is well known for only serving videos. If you look at other articles you will see that it is a system that
by Tagbert 4y ago
It only seems redundant in this case because YouTube is well known for only serving videos. If you look at other articles you will see that it is a system that identifies the doc-type and the host name for the article. Your might also see [video](bbc.co.uk) in which case there is no redundancy.
You will see a lot of articles marked [PDF](somesite.com) indicating that the doctype is PDF rather and the default html page. There may be other doc types like that but those are the most common. I have not notice a list of possible values anywhere.